Output the error when failing to update the order

[loevgaard]

Fixes #36

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 73.51%. Comparing base (fbd91c8) to head (6ab1891).
Report is 3 commits behind head on master.

Files	Patch %	Lines
src/Controller/EditOrderAction.php	55.55%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #37      +/-   ##
============================================
- Coverage     73.71%   73.51%   -0.20%     
  Complexity       72       72              
============================================
  Files            28       28              
  Lines           369      370       +1     
============================================
  Hits            272      272              
- Misses           97       98       +1     

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